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oracle out of memory

ÓÐһ̨·þÎñÆ÷,²Ù×÷ϵͳÊÇsolaris x86(32),»úÆ÷ÓÐ16GÄÚ´æ,°²×°oralce10.2,Èç¹û·ÖÅ䏸oracleµÄÄÚ´æ´ó,¾Í±¨out of memory´íÎó,ÏÖÔÚÖ»ÄÜ·ÖÅäСÓÚ4GµÄÄÚ´æ.  ÈçºÎ½â¾ö?

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set rlim_fd_max=65536
set shmsys:shminfo_shmmin=1
set semsys:seminfo_semmap=900
set semsys:seminfo_semmnu=1024
set semsys:seminfo_semume=200
set semsys:seminfo_semopm=100
set semsys:seminfo_semvmx=32767

set rlim_fd_cur=8192
set semsys:seminfo_semmni=1024
set semsys:seminfo_semmns=1024
set semsys:seminfo_semmsl=256
set shmsys:shminfo_shmmax=4294967295
set shmsys:shminfo_shmseg=1200
set shmsys:shminfo_shmmni=1024
set msgsys:msginfo_msgmax=8192
set msgsys:msginfo_msgmni=50
set msgsys:msginfo_msgtql=2000
set msgsys:msginfo_msgmnb=200000

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update table_a A
  set A.flag=1
  where A.id in (select B.id from table_b B)
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  set A.flag=1
  where ......
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